An 18-pound gun from the U.S. Frigate Constellation

On view at the Hampton Roads Naval Museum, this 18-pound naval gun weighs 4,700 pounds. The American defenders at Craney Island mounted one of these guns in tandem with two 24-pounders.

On view at the Hampton Roads Naval Museum, this 18-pound naval gun weighs 4,700 pounds. The American defenders at Craney Island mounted one of these guns in tandem with two 24-pounders. (Courtesy of the Hampton Roads Naval Museum)

On view at the Hampton Roads Naval Museum, this 18-pound naval gun weighs 4,700 pounds. The American defenders at Craney Island mounted one of these guns in tandem with two 24-pounders.